Highly Conductive and Wettable PEDOT:PSS for Simple and Efficient Organic/c-Si Planar Heterojunction Solar Cells

被引:28
作者
Yu, Lei-Ming [1 ,2 ]
Chen, Tao [1 ]
Feng, Nianjun [1 ,2 ]
Wang, Rongfei [1 ,3 ]
Sun, Tao [1 ]
Zhou, Yao [1 ]
Wang, Hai [1 ,4 ,5 ]
Yang, Yu [1 ]
Lu, Zheng-Hong [1 ,2 ,3 ,6 ]
机构
[1] Yunnan Univ, Sch Energy, Int Joint Res Ctr China Optoelect & Energy Mat, Kunming 650091, Yunnan, Peoples R China
[2] Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China
[3] Yunnan Univ, Ctr Optoelect Engn Res, Kunming 650091, Yunnan, Peoples R China
[4] Yunnan Univ, Dept Mat Sci & Engn, Kunming 650091, Yunnan, Peoples R China
[5] Kunming Univ, Key Lab Yunnan Prov Higher Educ Inst Organ Optoel, Kunming 650214, Yunnan, Peoples R China
[6] Univ Toronto, Dept Mat Sci & Engn, Toronto, ON M5S 3E4, Canada
基金
中国国家自然科学基金;
关键词
carrier concentrations; interfacial passivations; material modifications; organic/Si heterojunctions; solar cells; PERFORMANCE; POLYMER; FILM; MORPHOLOGY; HOLE;
D O I
10.1002/solr.201900513
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The key for fabricating efficient organic/n-Si planar heterojunction solar cells is the organic semiconductor layer, which governs key steps in photocarrier harvesting such as charge carrier separation and extraction. Typical organic semiconductors, however, are inadequate to yield good device performance due to their low electrical conductivities and undesirable work functions. Herein, a method is proposed to boost charge carrier concentration in poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) from 10(18) to 10(22) cm(-3) by combining solvent p-doping and DMF treatment. This high carrier concentration induces significant band bending in the Si substrate and thus leads to an extended inversion zone near an organic/Si heterojunction. It is found that this type of heterojunction creates a broad built-in electric field and effective interface passivation. The highly conductive PEDOT:PSS enables a simple and efficient organic/n-Si planar heterojunction solar cell with a power conversion efficiency exceeding 13% without using complex light-trapping structures. This power efficiency is comparable with the highest value reported to date. Herein, the possibility of making effective organic/n-Si planar heterojunction solar cells simply by applying a layer of extremely conductive organic coating is demonstrated.
引用
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页数:8
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